<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        /* 在...之前 */
        span::before {
            content: "灿姐";
        }

        span::after {
            display: inline-block;
            width: 200px;
            height: 200px;
            background-color: skyblue;
            content: "那么好看";
        }
    </style>
</head>

<body>
    <span>为什么</span>
</body>

</html>